diff --git a/tests/testsctp.nim b/tests/testsctp.nim
index 7d381f2..448714f 100644
--- a/tests/testsctp.nim
+++ b/tests/testsctp.nim
@@ -29,9 +29,9 @@ suite "SCTP":
       dtls: Dtls
       sctp: Sctp
 
-  proc initSctpStack(localAddress: TransportAddress): SctpStackForTest =
-    result.localAddress = localAddress
-    result.udp = UdpTransport.new(result.localAddress)
+  proc initSctpStack(la: TransportAddress): SctpStackForTest =
+    result.udp = UdpTransport.new(la)
+    result.localAddress = result.udp.localAddress()
     result.stun = Stun.new(result.udp)
     result.dtls = Dtls.new(result.stun)
     result.sctp = Sctp.new(result.dtls)
@@ -45,8 +45,8 @@ suite "SCTP":
 
   asyncTest "Two SCTP nodes connecting to each other, then sending/receiving data":
     var
-      sctpServer = initSctpStack(initTAddress("127.0.0.1:4444"))
-      sctpClient = initSctpStack(initTAddress("127.0.0.1:5555"))
+      sctpServer = initSctpStack(initTAddress("127.0.0.1:0"))
+      sctpClient = initSctpStack(initTAddress("127.0.0.1:0"))
     let
       serverConnFut = sctpServer.sctp.accept()
       clientConn = await sctpClient.sctp.connect(sctpServer.localAddress)
@@ -68,9 +68,9 @@ suite "SCTP":
 
   asyncTest "Two DTLS nodes connecting to the same DTLS server, sending/receiving data":
     var
-      sctpServer = initSctpStack(initTAddress("127.0.0.1:4444"))
-      sctpClient1 = initSctpStack(initTAddress("127.0.0.1:5555"))
-      sctpClient2 = initSctpStack(initTAddress("127.0.0.1:6666"))
+      sctpServer = initSctpStack(initTAddress("127.0.0.1:0"))
+      sctpClient1 = initSctpStack(initTAddress("127.0.0.1:0"))
+      sctpClient2 = initSctpStack(initTAddress("127.0.0.1:0"))
     let
       serverConn1Fut = sctpServer.sctp.accept()
       serverConn2Fut = sctpServer.sctp.accept()
diff --git a/webrtc/stun/stun_connection.nim b/webrtc/stun/stun_connection.nim
index 9d661a2..d732041 100644
--- a/webrtc/stun/stun_connection.nim
+++ b/webrtc/stun/stun_connection.nim
@@ -201,7 +201,7 @@ proc new*(
   ##
   var self = T(
     udp: udp,
-    laddr: udp.laddr,
+    laddr: udp.localAddress(),
     raddr: raddr,
     closed: false,
     dataRecv: newAsyncQueue[seq[byte]](StunMaxQueuingMessages),
diff --git a/webrtc/stun/stun_transport.nim b/webrtc/stun/stun_transport.nim
index becc593..3d52f53 100644
--- a/webrtc/stun/stun_transport.nim
+++ b/webrtc/stun/stun_transport.nim
@@ -108,7 +108,7 @@ proc new*(
   ##
   var self = T(
     udp: udp,
-    laddr: udp.laddr,
+    laddr: udp.localAddress(),
     usernameProvider: usernameProvider,
     usernameChecker: usernameChecker,
     passwordProvider: passwordProvider,
diff --git a/webrtc/udp_transport.nim b/webrtc/udp_transport.nim
index e458a5e..1f1625c 100644
--- a/webrtc/udp_transport.nim
+++ b/webrtc/udp_transport.nim
@@ -23,7 +23,7 @@ type
     raddr: TransportAddress
 
   UdpTransport* = ref object
-    laddr*: TransportAddress
+    laddr: TransportAddress
     udp: DatagramTransport
     dataRecv: AsyncQueue[UdpPacketInfo]
     closed: bool
@@ -33,7 +33,7 @@ const UdpTransportTrackerName* = "webrtc.udp.transport"
 proc new*(T: type UdpTransport, laddr: TransportAddress): T =
   ## Initialize an Udp Transport
   ##
-  var self = T(laddr: laddr, closed: false)
+  var self = T(closed: false)
 
   proc onReceive(
       udp: DatagramTransport,
@@ -49,6 +49,7 @@ proc new*(T: type UdpTransport, laddr: TransportAddress): T =
 
   self.dataRecv = newAsyncQueue[UdpPacketInfo]()
   self.udp = newDatagramTransport(onReceive, local = laddr)
+  self.laddr = self.udp.localAddress()
   trackCounter(UdpTransportTrackerName)
   return self
 
@@ -87,3 +88,6 @@ proc read*(self: UdpTransport): Future[UdpPacketInfo] {.async: (raises: [Cancell
     return
   trace "UDP read"
   return await self.dataRecv.popFirst()
+
+proc localAddress*(self: UdpTransport): TransportAddress =
+  self.laddr